Hello all I am new I live in Arizona and i have had some issue with my in ground pool =/- 16000 gal and I have black algae all in the bottom of my pool. Now with today economy I really hate to go out and buy a couple hundred dollars of chemicals. I was hoping someone could get me step by step instructions on fixing this problem while its empty for a couple days. I know its not good idea to have a plaster pool empty but its cool outside and there expecting clouds the next couple days.

Q #1 can i use a pressure washer inside my pool? Fan spray Q #2 What will get that Black Algae out of my pool?

Now I have a in ground cleaning system and I don't think I am getting good pressure, when the pump turns on you can not see much water moving except on the Steps. Since there is a pop up there.

Q#3 How could I check my lines to make sure there are not plugged up?Q#4 What size pump is average?

I don't think my builder pout a big enough pump...
Now on my pressure meter onto of the Filters its says I have 20-25 for pressure but I would think that the pop ups would be making waves.